--- pymol-open-source-2.3.0.orig/setup.py_orig	2016-10-07 10:52:09.874178679 -0400
+++ pymol-open-source-2.3.0/setup.py	2016-10-07 10:56:46.198125842 -0400
@@ -273,7 +273,7 @@
     # legacy stuff
     '-Wno-char-subscripts',
     # optimizations
-    "-Og" if DEBUG else "-O3",
+    "-Og" if DEBUG else "-O2",
 ]
 ext_link_args = []
 ext_objects = []